Github user nsuke commented on the issue:
https://github.com/apache/thrift/pull/1084
This replaces current Swift2 generator/lib with new one which supports
Swift3. The current one is still kept as option `swift:cocoa`, though.
Swift 2 has been not usable with latest XCode for months now so it makes
sense to me to land this to master. Reviews have been done by contributors
before, although a few more cleanup might be needed.---
